Yeah they are very practical for the most part but you won't be doing and speed reloads with these pouches and most of the guns stock out the box are awful.
For example the mp40 needs either the AK hop mod or a 3d printed hop unit, new hop rubber, nub and barrel to make it useable. The mags need a few bb's under the spring to give it more tension so you end up with real caps unless you can find the 100rd plastic mid caps.
The MP44 needs pretty much the same but it's all just M4 internals so it's super easy and turns into a beast with very little work.
Most of the spring k98k's are fantastic though even stock apart from any that are shell ejecting as they tend to break almost instantly and are only good as a base stock to put say a vsr or similar in them.
Gas k98k's tend to be a bit crap and we avoid them within the group as most of us haven't had good experiences with them. The PPS gas k98k being the only exception.
As far as allied weapons go the Thompson is pretty solid from most brands and the cheap cyma one (£90) is a real surprise gun. Tiny bit of work and it's shockingly good.
The sten is basically as bad as the mp40 and needs just as much work with similar issues.
The ICS m1 garand is stunning though and my guys loved theirs when we did 101st airborne kits.